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carbon-lang/toolchain/check/testdata/named_constraint/convert.carbon
T
Geoff RomerandRichard Smith e023f75254 Implement thunking in terms of constant evaluation (#7332) 
The bulk of this change is changing most pattern insts to be `Always`
rather than `AlwaysUnique` constants, so that they can be wrapped in
`SpecificConstant`s to perform substitution. That then lets thunking
rely much more on `SpecificConstant` wrappers instead of deep-copying
the inst tree with modified types.

This approach to thunking should scale better, particularly as things
like form generics make function signatures more complex, because we can
leverage the existing support for constant evaluation and substitution.
Unfortunately, applying this approach to binding patterns will require
more work; see the TODO near the top of `thunk.cpp` for details.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2026-06-13 00:22:00 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/convert.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/named_constraint/convert.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/named_constraint/convert.carbon
// --- type_and_with_named_constraint_self.carbon
library "[[@TEST_NAME]]";
constraint E {}
fn F(unused T:! E) {}
//@dump-sem-ir-begin
fn G(T:! E & E) {
F(T);
}
//@dump-sem-ir-end
// --- compatible_constraints.carbon
library "[[@TEST_NAME]]";
constraint E1 {}
constraint E2 {}
fn F(unused T:! E1) {}
//@dump-sem-ir-begin
fn G(T:! E2) {
F(T);
}
//@dump-sem-ir-end
// --- unspecified.carbon
library "[[@TEST_NAME]]";
interface Z {}
constraint E {
require impls Z;
}
fn F(unused T:! E) {}
class C {}
impl C as Z {}
fn G(T:! Z) {
// Anything that impls Z also impls E, since that's all it requires. Nothing
// needs to specify that T impls E.
F(T);
// Same for concrete types.
F(C);
}
// CHECK:STDOUT: --- type_and_with_named_constraint_self.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %E.type: type = facet_type <@E> [concrete]
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %pattern_type.9a5: type = pattern_type %E.type [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %BitAndWith.type.802: type = facet_type <@BitAndWith, @BitAndWith(type)> [concrete]
// CHECK:STDOUT: %BitAndWith.impl_witness: <witness> = impl_witness imports.%BitAndWith.impl_witness_table [concrete]
// CHECK:STDOUT: %BitAndWith.facet: %BitAndWith.type.802 = facet_value type, (%BitAndWith.impl_witness) [concrete]
// CHECK:STDOUT: %BitAndWith.WithSelf.Op.type.38f: type = fn_type @BitAndWith.WithSelf.Op, @BitAndWith.WithSelf(type, %BitAndWith.facet) [concrete]
// CHECK:STDOUT: %.d56: type = fn_type_with_self_type %BitAndWith.WithSelf.Op.type.38f, %BitAndWith.facet [concrete]
// CHECK:STDOUT: %type.as.BitAndWith.impl.Op.type: type = fn_type @type.as.BitAndWith.impl.Op [concrete]
// CHECK:STDOUT: %type.as.BitAndWith.impl.Op: %type.as.BitAndWith.impl.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %type.as.BitAndWith.impl.Op.bound: <bound method> = bound_method %E.type, %type.as.BitAndWith.impl.Op [concrete]
// CHECK:STDOUT: %T.patt.3a0592.2: %pattern_type.9a5 = symbolic_binding_pattern T, 0 [symbolic]
// CHECK:STDOUT: %T.f45530.2: %E.type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %F.specific_fn: <specific function> = specific_function %F, @F(%T.f45530.2) [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.9c3: %type.as.BitAndWith.impl.Op.type = import_ref Core//prelude/parts/as, loc{{\d+_\d+}}, loaded [concrete = constants.%type.as.BitAndWith.impl.Op]
// CHECK:STDOUT: %BitAndWith.impl_witness_table = impl_witness_table (%Core.import_ref.9c3), @type.as.BitAndWith.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {
// CHECK:STDOUT: %T.patt.loc8_7.1: %pattern_type.9a5 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc8_7.2 (constants.%T.patt.3a0592.2)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc8_12.1: type = splice_block %.loc8_12.3 [concrete = constants.%E.type] {
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %E.ref.loc8_10: type = name_ref E, file.%E.decl [concrete = constants.%E.type]
// CHECK:STDOUT: %E.ref.loc8_14: type = name_ref E, file.%E.decl [concrete = constants.%E.type]
// CHECK:STDOUT: %impl.elem0: %.d56 = impl_witness_access constants.%BitAndWith.impl_witness, element0 [concrete = constants.%type.as.BitAndWith.impl.Op]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %E.ref.loc8_10, %impl.elem0 [concrete = constants.%type.as.BitAndWith.impl.Op.bound]
// CHECK:STDOUT: %type.as.BitAndWith.impl.Op.call: init type = call %bound_method(%E.ref.loc8_10, %E.ref.loc8_14) [concrete = constants.%E.type]
// CHECK:STDOUT: %.loc8_12.2: type = value_of_initializer %type.as.BitAndWith.impl.Op.call [concrete = constants.%E.type]
// CHECK:STDOUT: %.loc8_12.3: type = converted %type.as.BitAndWith.impl.Op.call, %.loc8_12.2 [concrete = constants.%E.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc8_7.2: %E.type = symbolic_binding T, 0 [symbolic = %T.loc8_7.1 (constants.%T.f45530.2)]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @G(%T.loc8_7.2: %E.type) {
// CHECK:STDOUT: %T.patt.loc8_7.2: %pattern_type.9a5 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc8_7.2 (constants.%T.patt.3a0592.2)]
// CHECK:STDOUT: %T.loc8_7.1: %E.type = symbolic_binding T, 0 [symbolic = %T.loc8_7.1 (constants.%T.f45530.2)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %F.specific_fn.loc9_3.2: <specific function> = specific_function constants.%F, @F(%T.loc8_7.1) [symbolic = %F.specific_fn.loc9_3.2 (constants.%F.specific_fn)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT: %T.ref: %E.type = name_ref T, %T.loc8_7.2 [symbolic = %T.loc8_7.1 (constants.%T.f45530.2)]
// CHECK:STDOUT: %F.specific_fn.loc9_3.1: <specific function> = specific_function %F.ref, @F(constants.%T.f45530.2) [symbolic = %F.specific_fn.loc9_3.2 (constants.%F.specific_fn)]
// CHECK:STDOUT: %F.call: init %empty_tuple.type = call %F.specific_fn.loc9_3.1()
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @G(constants.%T.f45530.2) {
// CHECK:STDOUT: %T.patt.loc8_7.2 => constants.%T.patt.3a0592.2
// CHECK:STDOUT: %T.loc8_7.1 => constants.%T.f45530.2
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- compatible_constraints.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %E1.type: type = facet_type <@E1> [concrete]
// CHECK:STDOUT: %E2.type: type = facet_type <@E2> [concrete]
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %pattern_type.9a587c.2: type = pattern_type %E2.type [concrete]
// CHECK:STDOUT: %T.patt.3a0592.2: %pattern_type.9a587c.2 = symbolic_binding_pattern T, 0 [symbolic]
// CHECK:STDOUT: %T.f45530.2: %E2.type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %T.as_type: type = facet_access_type %T.f45530.2 [symbolic]
// CHECK:STDOUT: %E1.facet: %E1.type = facet_value %T.as_type, () [symbolic]
// CHECK:STDOUT: %F.specific_fn: <specific function> = specific_function %F, @F(%E1.facet) [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {
// CHECK:STDOUT: %T.patt.loc9_7.1: %pattern_type.9a587c.2 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc9_7.2 (constants.%T.patt.3a0592.2)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc9: type = splice_block %E2.ref [concrete = constants.%E2.type] {
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %E2.ref: type = name_ref E2, file.%E2.decl [concrete = constants.%E2.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc9_7.2: %E2.type = symbolic_binding T, 0 [symbolic = %T.loc9_7.1 (constants.%T.f45530.2)]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @G(%T.loc9_7.2: %E2.type) {
// CHECK:STDOUT: %T.patt.loc9_7.2: %pattern_type.9a587c.2 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc9_7.2 (constants.%T.patt.3a0592.2)]
// CHECK:STDOUT: %T.loc9_7.1: %E2.type = symbolic_binding T, 0 [symbolic = %T.loc9_7.1 (constants.%T.f45530.2)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %T.as_type.loc10_6.2: type = facet_access_type %T.loc9_7.1 [symbolic = %T.as_type.loc10_6.2 (constants.%T.as_type)]
// CHECK:STDOUT: %E1.facet.loc10_6.2: %E1.type = facet_value %T.as_type.loc10_6.2, () [symbolic = %E1.facet.loc10_6.2 (constants.%E1.facet)]
// CHECK:STDOUT: %F.specific_fn.loc10_3.2: <specific function> = specific_function constants.%F, @F(%E1.facet.loc10_6.2) [symbolic = %F.specific_fn.loc10_3.2 (constants.%F.specific_fn)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT: %T.ref: %E2.type = name_ref T, %T.loc9_7.2 [symbolic = %T.loc9_7.1 (constants.%T.f45530.2)]
// CHECK:STDOUT: %T.as_type.loc10_6.1: type = facet_access_type %T.ref [symbolic = %T.as_type.loc10_6.2 (constants.%T.as_type)]
// CHECK:STDOUT: %E1.facet.loc10_6.1: %E1.type = facet_value %T.as_type.loc10_6.1, () [symbolic = %E1.facet.loc10_6.2 (constants.%E1.facet)]
// CHECK:STDOUT: %.loc10: %E1.type = converted %T.ref, %E1.facet.loc10_6.1 [symbolic = %E1.facet.loc10_6.2 (constants.%E1.facet)]
// CHECK:STDOUT: %F.specific_fn.loc10_3.1: <specific function> = specific_function %F.ref, @F(constants.%E1.facet) [symbolic = %F.specific_fn.loc10_3.2 (constants.%F.specific_fn)]
// CHECK:STDOUT: %F.call: init %empty_tuple.type = call %F.specific_fn.loc10_3.1()
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @G(constants.%T.f45530.2) {
// CHECK:STDOUT: %T.patt.loc9_7.2 => constants.%T.patt.3a0592.2
// CHECK:STDOUT: %T.loc9_7.1 => constants.%T.f45530.2
// CHECK:STDOUT: }
// CHECK:STDOUT:
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